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Fig. 10-10 Selectivity ratio of stagger-tuned stages.

Fig. 10-10 Selectivity ratio of stagger-tuned stages.

It is instructive to display these relationships graphically, as in Fig. 10-10, which permits one to see quickly the relative merits of various combinations.

For the example at hand, the selectivity ratios for the three alternatives are:

m X n Selectivity ratio

1X3 8.4

5X1 7.0

2X2 5.7

1X4 4.9

System requirements will have to govern the choice here. It would appear that, in going to four tubes, one might as well use the 1X4 combination and achieve the better selectivity ratio and higher gain. Here again, however, the system situation might favor the 2X2, since it has only two different interstage types to manufacture and to align.

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